1) ______ the Oral Approach
2) ______ the Cognitive Approach
3) ______ the Communicative Approach
4) ______ the Audiolingnal Method
5) ______ the Direct Method
a) The use of drills and pattern practice is one of its distinctive features.
b) The practice techniques adopted in this approach generally consists of guided repetition and substitution activity.
c) Written work should be graded.
d) Role play and simulation activities are often thought to be one of the most effective ways of integrating language skills in the language classroom.
e) It seeks the intellectual understanding by the learner of the language as a system.

C甲、乙之间形成不当得利之债法律关系，甲应返还1000元给乙（）

A．甲、乙之间形成无因管理之债法律关系，乙应支付甲屠宰费50元

B．甲、乙之间形成不当得利之债法律关系，甲应返还450元给乙

C．甲、乙之间形成遗失物返还法律关系，甲应返还500元给乙